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Why Is My AC Blowing Warm Air in Cooling Mode?

AC units are essential for maintaining comfort during the scorching summer months, but encountering unexpected issues with their function can be perplexing. One such situation is when your AC seemingly turns on the heater, even when set to cooling mode. Understanding the possible reasons behind this occurrence is crucial to rectifying the problem.

Thermostat Settings and Calibration

A thermostat is responsible for sensing the temperature of an area and signaling the HVAC system to provide cooling or heating. If the thermostat needs replacing or repaired or even if it’s just incorrectly calibrated, it might misinterpret the ambient temperature. This leads to incorrect signals to the AC unit. This could cause the AC system to mistakenly engage the heating function instead of cooling, blowing warm air into the space.

Faulty Thermostat Wiring or Connections

Damaged or loose wires can disrupt the communication between the thermostat and the HVAC system, leading to incorrect signals being sent. As a result, the AC unit might receive mixed instructions, causing it to activate both the cooling and heating functions simultaneously. If this situation occurs, a quick AC repair will be able to get the air conditioning system back to working efficiently.

Refrigerant Issues

Issues with the refrigerant levels or the refrigerant cycle in the AC unit can also create a problem. If the refrigerant charge is incorrect or there is a leak, it can affect the system’s cooling capacity. As a result, the AC may struggle to provide sufficient cooling, prompting the auxiliary heating system to kick in to compensate for the deficiency, even when the cooling mode is selected.

System Control Board Malfunction

The control board in the AC unit is responsible for coordinating and regulating various system functions. A malfunctioning control board might send incorrect signals to the different components of an HVAC system, leading to erratic behavior. This can include turning on the heater as well as the cooling function. Electronic glitches, power surges, or component damage can cause control board issues.

Get in Touch With Professionals Today

Discover the epitome of comfort and efficiency with Metro Heating & Cooling. Our top-notch heating, cooling, and geothermal services provide you with the perfect indoor environment all year. Serving Des Moines, IA, and the surrounding areas, we take pride in transforming your space into a sanctuary of comfort. Whether it’s the sweltering heat of summer or the chilling cold of winter, our expert team is here to cater to all your HVAC needs from installation to repairs to tune-ups. Call Metro Heating & Cooling today to schedule an appointment for cleaning your ductwork, fireplace service, zoning system maintenance, or seasonal maintenance.